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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28132de13b0464d55b1bdba2b7488149de8321e3e4a0cd806d6bcbb666f0fe0f' 
  AND token = 'VN70PQ37PaMC0eKx6TvROhsobF/897bS23YgyTLZPNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}